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  Encyclopedia of Keywords > Society > Humans > Medicine > Heart Rate   Michael Charnine

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  1. Heart rate is a term used to describe the frequency of the cardiac cycle.
  2. Heart rate is a predictor of success in the treatment of adults with symptomatic paroxysmal supraventricular tachycardia.
  3. Heart rate: The number of heart beats per unit time, usually per minute.
  4. The heart rate is based on the number of contractions of the ventricles (the lower chambers of the heart).
  5. Heart rate is a measure of the ventricular rather than atrial activity.

Heart Rates

  1. Tachycardia is a resting heart rate more than 100 beats per minute.
  2. Athletes sometimes measure their resting heart rate as one way to find out if they're over trained.


  1. Maximum Heart Rate (also called MHR, or HR max) is the maximum heart rate that a person can achieve during maximal physical exertion.
  2. Heart rate reserve (HRR) is a term used to describe the difference between a person's measured or predicted maximum heart rate and resting heart rate.
  3. Stop, get off the bike (this is for safety reasons - not mandatory) and immediately check your heart rate at its maximum for a full 60 seconds.
  4. Continuous electrocardiographic monitoring of the heart rate is routinely done in many clinical settings, especially in critical care medicine.


  1. A heart rate that stays below 50 beats per minute is called bradycardia.
  2. The recovery heart rate is one that is taken several minutes after exercise.
  3. The current definition of sinus tachycardia is a heart rate 100 beats per minute (bpm).
  4. The heart rate during normal sinus rhythm is 60 to 100 beats per minute (BPM).
  5. Control of heart rate The heart contains two cardiac pacemaker s that spontaneously cause the heart to beat.

Rate Reserve

  1. Some methods of measurement of exercise intensity measure percentage of heart rate reserve.
  2. Additionally, as a person increases their cardiovascular fitness, their HR rest will drop, thus the heart rate reserve will increase.

Target Heart

  1. MHR is used as a base number to calculate target heart rate for exercise (see below).[3] The heart beats about 60 to 80 times a minute when we're at rest.
  2. HR max is used frequently in the fitness industry, specifically during the calculation of Target Heart Rate when prescribing a fitness regimen.
  3. Patient was subjected to modified treadmill stress test and she achieved target heart rate without any symptom during 14 minute walk.

Slow Heart

  1. If another medical problem, such as hypothyroidism or an electrolyte imbalance, is causing a slow heart rate, treating that problem may cure the bradycardia.
  2. If hypothyroidism is causing a slow heart rate, it is treated with thyroid hormones.
  3. If the sinus node is not functioning normally, it is reflected in an abnormally slow heart rate (bradycardia).


  1. An arrhythmia is any disorder of heart rate or rhythm.
  2. Bradycardia is a slower than normal heart rate.
  3. Heart rate, heart rhythm, blood pressure and electrical changes on the 12-lead electrocardiogram are monitored throughout the testing procedure.
  4. Several parameters are measured including VO2, O2 saturation, heart rate, heart rhythm and blood pressure.
  5. Neurocardiogenic syncope results from excessive autonomic reflex activity, which shows as abnormal vascular tone and heart rate.


  1. Heart rate control drugs and antiarrhythmic drugs may be prescribed to treat irregular heart rhythms.
  2. CONCLUSIONS: Heart rate predicts restoration of sinus rhythm in adult subjects with symptomatic episodes of PSVT treated with adenosine and verapamil.
  3. SA node: The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate.
  4. The (ventricular) heart rate is, therefore, determined by how many impulses the AV node can conduct.
  5. QRS complex and a heart rate of 40 beats per minute are less, usually have conduction blocked below the level of the AV node.

Rate Variability

  1. Effect of fish oil on heart rate variability in survivors of myocardial infarction: a double blind randomised controlled trial.
  2. Heart rate variability analysis is the evaluation of beat to beat variability of the R-R interval.


  1. The speed at which a person's heart rate returns to resting is faster for a fit person than an unfit person.
  2. Your heart rate, pulse, and blood pressure will be closely monitored and the catheter insertion site checked for bleeding.
  3. If the patient's heart rate is too slow, these devices typically do not pace the heart to make it beat faster.


  1. Often, the rhythm produced is more rapid than normal, but the difficulty is in obtaining control of the heart rate both at rest and with exercise.
  2. Producing an electrocardiogram, or ECG (also abbreviated EKG), is one of the most precise methods of heart rate measurement.
  3. Many exercise machines (stationary bikes, treadmills, etc) have a built-in heart rate monitors.
  4. To test this, you will walk and run on a treadmill — or ride a stationary bicycle — while your heart rate and rhythm are monitored.
  5. Drugs, which suppress contractility (negative inotropic agents) and suppress heart rate (negative chronotropic agents), have been the mainstays of therapy.


  1. Mean heart rate, 314 ± 2.6 beats min –1; QRS width, 24.2 ± 2.1 ms.
  2. Standard ECG measurements including heart rate, PR interval, and QRS and QT durations were not significantly different between groups.

Per Minute

  1. Bradycardia is defined as a heart rate less than 60 beats per minute although it is seldom symptomatic until below 50 bpm.
  2. Sinus bradycardia originates in the sinoatrial node and is characterized by a heart rate less than 60 beats per minute.
  3. Relative intensity refers to the percent of aerobic power utilized during exercise and is expressed as percent of maximal heart rate or percent of O 2 max.
  4. Faint, if a slow heart rate causes a drop in blood pressure.


  1. The BP and heart rate were measured in triplicate after the participants had been lying for 15 minutes.
  2. Simple blood pressure and heart rate measurements while lying, seated, and standing can confirm the presence of orthostatic hypotension.

Rate Monitors

  1. Commercial heart rate monitors are also available, consisting of a chest strap with electrodes.
  2. Commercially available heart rate monitors are also available, consisting of a chest strap with electrodes.


  1. These symptoms are especially common when atrial fibrillation results in a heart rate which is either too fast or too slow.
  2. This condition can cause symptoms such as weakness, fatigue, dizziness, fainting, or palpitations if the heart rate becomes too fast.
  3. Drugs such as adrenaline can increase heart rate and strength of contractions, although also promote tachyarrhythmias.
  4. A pacemaker is a device placed under your skin that helps correct the slow heart rate.
  5. Many newer ICDs can also function as a pacemaker by delivering an electrical signal to regulate a heart rate that is too slow.

Fast Heart

  1. This weakened condition, termed chronotropic cardiomyopathy, is usually a result of a long period of tachycardia(fast heart rate).
  2. Ventricular tachycardia - a fast heart rate that originates in the lower chambers (ventricles).
  3. Supraventricular tachycardia - a fast heart rate that originates in the upper chambers (atria).
  4. This test can also rule out other causes of an erratic or fast heart rate.


  1. The high (ineffective) sympathetic activity is always modulated by vagal outflow, in these cases leading to excessive slowing of heart rate.
  2. Influences of heart rate and vagal stimulation.


  1. Ambulatory heart rate was recorded with a portable intermittent technique in 807 subjects.
  2. Palatini P. Office versus ambulatory heart rate in the prediction of the cardiovascular risk.
  3. In the Syst-Eur study, higher ambulatory heart rate was associated with increased cancer mortality.


  1. The QT interval varies based on the heart rate, and various correction factors have been developed to correct the QT interval for the heart rate.
  2. It is also possible to measure heart rate acoustically, by listening to the sounds the heart makes while beating.
  3. Sinus arrhythmia: A condition in which the heart rate varies with breathing.


  1. A variety of situations stimulate the vagus nerve, which leads to a slowing of the heart rate and dilation of the body's blood vessels.
  2. Since then, 60 anecdotal cases have been reported in which ictal episodes were accompanied by slowing of the heart rate or asystole.

Cardiac Output

  1. The pulse is the most straightforward way of measuring the heart rate, but it can be deceptive when some strokes do not lead to much cardiac output.
  2. When cardiac output increases in a healthy but untrained individual, most of the increase can be attributed to increase in heart rate.

Stroke Volume

  1. The length of the cardiac cycle is known and determines heart rate, and thereby Q can be calculated as the product of stroke volume and heart rate.
  2. It is equal to the heart rate multiplied by the stroke volume.
  3. When caring for these patients, it helps to remember that cardiac output = stroke volume x heart rate.


  1. Encyclopedia of Keywords > Society > Humans > Medicine
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  3. Glossaries > Glossary of Cardiology /
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  Originally created: May 04, 2008.
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